Transmitter for telephones



(No Model.)

M'. 0. ANTHONY. TRANSMITTER POR'TELEPHONES.

No. 526.888. Patehted Oct. 2, 1894.-

Y, M a M QM I 7 i I @311 afloat mu NITED STATES PATENT OFFICE.

MARK Oy-ANTHONY, OF CINCINNATI, OHIO.

TRANSMITTER FOR TELEPHONES.

SPECIFICATION forming part of Letters Patent No. 526,888, dated October2, 1894.

To aZZ whom it may concern.-

Be it known that 1, MARK O. ANTHONY, a citizen of the United States ofAmerica, re siding at Cincinnati, in the county of Hamilton and State ofOhio, have invented certain new and useful Improvements in Transmit--mitting instruments of this class now in use,

is the rattling, or jarring or vibratory noise incident to their use. Ifind that this vibratory noise is largely due to the freedom of thepencils to rotate in their bearings.

The objects of my invention are to provide transmitting mechanism whichdispenses with the rattling, jarring or vibratory noise incident to thetransmitters now in use, and to arrange the maximum number of carboncontacts in a given space, and the invention consists in the parts andcombination and arrangement of parts hereinafter described and claimed.

In the drawings: Figure 1 is a front viewof one form of my improvedtransmitter, and Fig. 2 a like view of a modified form.

A represents the supporting plate or diaphragm; b, c, d, and e, carbonblocks secured thereto; f, g, h and v a series of carbon pencils,mounted in the blocks; j, (Fig. 1,) a carbon pencil having its bearingsin pencils, f and i; j, a carbon pencil having its bearings in pencils 9and h, and lo a carbon pencil having its bearings in the transversepencils j and 9".

Application filed July 28,1894. SerialNo. 518,829. (No model.)

It will be seen that pencils f and c' and g and h, are locked againstrotation by the transverse pencils j and j which are in turnlockedagainst rotation by pencil is.

In the form shown in Fig. 2, a pencil, Z, connects two oppositelymounted pencils, g and i, of the series and the other pencils of theseries are connected with the transverse pencil Z by means of pencils,mand m. This method of mounting permits the use of cylindrical bearings,thus giving alarger area of contact and yet locks substantially all ofthe pencils against rotation.

I claim as my invention- 1. The combination, in a telephonetransmitter,with a supporting plate or diaphragm, of a series of carbonblocks projecting from the supporting plate; a series of carbon pencilsextending from block to block; and a transverse pencil or pencilsconnecting one or more "pairs of pencils in the series and locking themagainst rotation, substantially as and for the purpose specified.

2. The combination in a telephone transmitter, with asupporting plate ordiaphragm, of a series of carbon blocks projecting from the supportingplate; a series of carbon pencils extending from block to' block; apencil extending from one of the series of an oppositely mounted penciland adapted to hold them against rotation, and a pencil or pencilsconnecting other members of the series with the transverse pencil andadapted to hold them against rotation, substantially as and for thepurpose specified.

M. O. ANTHONY. Witnesses:

ARTHUR E. GEORGI, BENJAMIN BLOOH.

